diff --git a/esphome/components/adc/adc_sensor.h b/esphome/components/adc/adc_sensor.h
index 71318987479..46b7e7a2ffd 100644
--- a/esphome/components/adc/adc_sensor.h
+++ b/esphome/components/adc/adc_sensor.h
@@ -94,7 +94,7 @@ class ADCSensor final : public sensor::Sensor, public PollingComponent, public v
   ///   - SamplingMode::MIN: Use the lowest sample value
   ///   - SamplingMode::MAX: Use the highest sample value
   /// @param sampling_mode The desired sampling mode to use for aggregating ADC samples.
-  void set_sampling_mode(SamplingMode sampling_mode);
+  void set_sampling_mode(SamplingMode sampling_mode) { this->sampling_mode_ = sampling_mode; }
 
   /// Perform a single ADC sampling operation and return the measured value.
   /// This function handles raw readings, calibration, and averaging as needed.
diff --git a/esphome/components/adc/adc_sensor_common.cpp b/esphome/components/adc/adc_sensor_common.cpp
index 5ca58df10e0..70211000c3d 100644
--- a/esphome/components/adc/adc_sensor_common.cpp
+++ b/esphome/components/adc/adc_sensor_common.cpp
@@ -76,6 +76,4 @@ void ADCSensor::set_sample_count(uint8_t sample_count) {
   }
 }
 
-void ADCSensor::set_sampling_mode(SamplingMode sampling_mode) { this->sampling_mode_ = sampling_mode; }
-
 }  // namespace esphome::adc